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Finding the Fourth Proportional to 174.28, 261.42 and 76.81

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Solution

The fourth proportional to 174.28, 261.42 and 76.81 is: 115.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.28 : 261.42 = 76.81 : x
  2. Step 2: Convert to fraction form
    174.28/261.42 = 76.81/x
  3. Step 3: Cross multiply
    174.28x = 261.42 × 76.81
  4. Step 4: Simplify right side
    174.28x = 20,079.67
  5. Step 5: Solve for x
    x = 20,079.67/174.28
  6. Step 6: Final answer
    x = 115.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.